Checkpointing changes

[yaffs2.git] / yaffs_guts.h

diff --git a/yaffs_guts.h b/yaffs_guts.h
index aaeda26e1c29703f36dee9560b0d647c0a890766..2da744940b09698983394d54dd68979915005679 100644 (file)
--- a/yaffs_guts.h
+++ b/yaffs_guts.h
@@ -14,7 +14,7 @@
  *
  * Note: Only YAFFS headers are LGPL, YAFFS C code is covered by GPL.
  *
- * $Id: yaffs_guts.h,v 1.20 2006-03-08 07:59:20 charles Exp $
+ * $Id: yaffs_guts.h,v 1.21 2006-05-08 10:13:34 charles Exp $
  */
 
 #ifndef __YAFFS_GUTS_H__
@@ -64,8 +64,11 @@
 
 #define YAFFS_NOBJECT_BUCKETS          256
 
+
 #define YAFFS_OBJECT_SPACE             0x40000
 
+#define YAFFS_NCHECKPOINT_OBJECTS      5000
+
 #ifdef CONFIG_YAFFS_UNICODE
 #define YAFFS_MAX_NAME_LENGTH          127
 #define YAFFS_MAX_ALIAS_LENGTH         79
@@ -76,12 +79,18 @@
 
 #define YAFFS_SHORT_NAME_LENGTH                15
 
-/* Some special object ids */
+/* Some special object ids for pseudo objects */
 #define YAFFS_OBJECTID_ROOT            1
 #define YAFFS_OBJECTID_LOSTNFOUND      2
 #define YAFFS_OBJECTID_UNLINKED                3
 #define YAFFS_OBJECTID_DELETED         4
 
+/* Sseudo object ids for checkpointing */
+#define YAFFS_OBJECTID_SB_HEADER       0x10
+#define YAFFS_OBJECTID_CHECKPOINT_DATA 0x20
+
+/* */
+
 #define YAFFS_MAX_SHORT_OP_CACHES      20
 
 #define YAFFS_N_TEMP_BUFFERS           4
@@ -463,6 +472,31 @@ typedef struct {
        int count;
 } yaffs_ObjectBucket;
 
+
+/* yaffs_CheckpointObject holds the definition of an object as dumped 
+ * by checkpointing.
+ */
+
+typedef struct {
+        int structType;
+       __u32 objectId;         
+       __u32 parentId;
+       int chunkId;
+                       
+       yaffs_ObjectType variantType:3;
+       __u8 deleted:1;         
+       __u8 softDeleted:1;     
+       __u8 unlinked:1;        
+       __u8 fake:1;            
+       __u8 renameAllowed:1;
+       __u8 unlinkAllowed:1;
+       __u8 serial;            
+       
+       int nDataChunks;        
+       __u32 fileSizeOrEquivalentObjectId;
+
+}yaffs_CheckpointObject;
+
 /*--------------------- Temporary buffers ----------------
  *
  * These are chunk-sized working buffers. Each device has a few
@@ -488,6 +522,13 @@ struct yaffs_DeviceStruct {
        int endBlock;           /* End block we're allowed to use */
        int nReservedBlocks;    /* We want this tuneable so that we can reduce */
                                /* reserved blocks on NOR and RAM. */
+       /* Stuff used by checkpointing */
+       int headerBlock;
+       int checkpointStartBlock;
+       int checkpointEndBlock;
+
+       
+
 
        int nShortOpCaches;     /* If <= 0, then short op caching is disabled, else
                                 * the number of short op caches (don't use too many)
@@ -558,13 +599,24 @@ struct yaffs_DeviceStruct {
 #endif
 
        int isMounted;
+       
+       int isCheckpointed;
 
        /* Stuff to support block offsetting to support start block zero */
        int internalStartBlock;
        int internalEndBlock;
        int blockOffset;
        int chunkOffset;
+       
 
+       /* Runtime checkpointing stuff */
+       int checkpointBlock;
+       int checkpointPage;
+       int checkpointByteCount;
+       int checkpointByteOffset;
+       __u8 *checkpointBuffer;
+       int checkpointOpenForWrite;
+       
        /* Block Info */
        yaffs_BlockInfo *blockInfo;
        __u8 *chunkBits;        /* bitmap of chunks in use */
@@ -657,6 +709,45 @@ struct yaffs_DeviceStruct {
 
 typedef struct yaffs_DeviceStruct yaffs_Device;
 
+/* The static layout of bllock usage etc is stored in the super block header */
+typedef struct {
+        int StructType;
+       int version;
+       int checkpointStartBlock;
+       int checkpointEndBlock;
+       int startBlock;
+       int endBlock;
+       int rfu[100];
+} yaffs_SuperBlockHeader;
+       
+/* The CheckpointDevice structure holds the device information that changes at runtime and
+ * must be preserved over unmount/mount cycles.
+ */
+typedef struct {
+        int structType;
+       int nErasedBlocks;
+       int allocationBlock;    /* Current block being allocated off */
+       __u32 allocationPage;
+       int nFreeChunks;
+
+       int nDeletedFiles;              /* Count of files awaiting deletion;*/
+       int nUnlinkedFiles;             /* Count of unlinked files. */
+       int nBackgroundDeletions;       /* Count of background deletions. */
+
+       /* yaffs2 runtime stuff */
+       unsigned sequenceNumber;        /* Sequence number of currently allocating block */
+       unsigned oldestDirtySequence;
+
+} yaffs_CheckpointDevice;
+
+
+typedef struct {
+    int structType;
+    __u32 magic;
+    __u32 version;
+    __u32 head;
+} yaffs_CheckpointValidity;
+
 /* Function to manipulate block info */
 static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk)
 {
@@ -675,8 +766,6 @@ static Y_INLINE yaffs_BlockInfo *yaffs_GetBlockInfo(yaffs_Device * dev, int blk)
 int yaffs_GutsInitialise(yaffs_Device * dev);
 void yaffs_Deinitialise(yaffs_Device * dev);
 
-void yaffs_FlushEntireDeviceCache(yaffs_Device *dev);
-
 int yaffs_GetNumberOfFreeChunks(yaffs_Device * dev);
 
 int yaffs_RenameObject(yaffs_Object * oldDir, const YCHAR * oldName,
@@ -705,6 +794,12 @@ yaffs_Object *yaffs_MknodFile(yaffs_Object * parent, const YCHAR * name,
                              __u32 mode, __u32 uid, __u32 gid);
 int yaffs_FlushFile(yaffs_Object * obj, int updateTime);
 
+/* Flushing and checkpointing */
+void yaffs_FlushEntireDeviceCache(yaffs_Device *dev);
+
+int yaffs_CheckpointSave(yaffs_Device *dev);
+int yaffs_CheckpointRestore(yaffs_Device *dev);
+
 /* Directory operations */
 yaffs_Object *yaffs_MknodDirectory(yaffs_Object * parent, const YCHAR * name,
                                   __u32 mode, __u32 uid, __u32 gid);